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.1. <br /> , 03 /�'`''2E 12:24 541 - 465 -4722 SATRE ASSOt�l ^ NAB'- " @1 <br /> ��\V V L 2 Oir#3 <br /> Si1npb :f.ed Approach Design Criteria - fir►WV pOrfitotcl `tD rcZi1 t '' 1 <br /> Vegetative Filter n�w�or "V L <br /> Flow spreader <br /> . ' 6-/e. <br /> ..., 1-- . <br /> ,... Afia <br /> __ <br /> .. do <br /> Ve <br /> -pr. 1.__./....- to <br /> Check dams @ s' <br /> intervals <br /> flow <br /> Impervious area • <br /> � \1 '' 017 � -t <br /> • t 1 4 .\1'I / ik ' ',� l,.. .,i 111 I or conveyance swale <br /> . * gll ►' . P .' ' <br /> .11 ;111111111 1111111'111111111 ;1111'11( 111 I1 ■111 f1 1111 1 ■11111 111111111 1 111111 111II1111f11r11 11111 11 11111 1111 Cyry ttl • <br /> 12 " topsoil ZfffM1: 111'1' iiY <br /> ' IF' 10 ft. minimum <br /> Section Not to Scale , <br /> Description <br /> Vegetative raters ale Bendy sloped areas, with direction of stormwater flow conforming to the slope. Stormwater <br /> enters the filter as sheet flow from a n impervious surface or is converted to shat flow using a flow spreader. Flow <br /> control is achieved using the relatively large surface aria and a generous proportion of check dams_ Pollutants are <br /> remove through filtration and sedimentation. Filters can be planted with a variety of trees, shrubs, and ground <br /> covers, including grasses. <br /> General speccutione (Acceptable soil lypcs A, B, C, & D) <br /> Filters shall bei a minimum o£ 20 R x 10 ft. Maximtun slope is 10%. Plantings shall be in a000ndan ce with <br /> Chapter 8.0, d r cove density shall be 60% of the filter surface area. Clay soils shall be amended with <br /> 50% sandy loaanm i g r the ound top 12" of the filter. Check dams shall be of durable, non-toxic materials- i.e., rock, brick, <br /> and old concrete. Check dams shall be 12" length x (width of filter) x 3-5" height. Filters designed using these <br /> criteria will not need to include a bypass of larger storms. Runoff shall enter the Wirer as predominately sheet <br /> flow. Check dams and flow spreaders are required. <br /> 1 o c w 11 G' t - eVV G102 r off 114 " —1 <br /> cr'j61 pr1 1 a- fg-PAev <br /> St o' mot cr Mcrlogcw11: Moril,al f oge 4 -6 <br /> At;oot eci Jo! y ' 1 1999 <br />